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Missing a part of GRS history
October 1st, 2012
To the editor: The article in the August 2012 magazine describing geosynthetic-reinforced soil (GRS) bridge abutments has a major element missing. The author shows an innocence of the history of this technology in that the name of Robert Barrett is absent. I designed and supervised the construction of abutments on a 140-ft tied-arch span in […]
A teaching guide to accompany an inexpensive geosynthetics textbook
October 1st, 2012
By Robert Koerner Within my faculty career, which began in 1968, the teaching of technical subjects such as geotechnical and geosynthetics engineering has gone from (a) writing on a chalkboard, to (b) prepared overhead transparencies, to (c) prepared 35mm slides, and now to (d) prepared computer-based PowerPoint® presentations. The following table attempts to capture the […]
GMA is the industry voice
October 1st, 2012
The Geosynthetic Materials Association represents at agencies and non-governmental organizations By Andrew Aho Agencies and non-governmental organizations (NGOs) rely on the Geosynthetic Materials Association (GMA) to be the prime resource for consistent and accurate information on the correct use of geosynthetics. These groups often reach out to GMA expert advice regarding geosynthetic applications, specifications, and […]
Explore, learn, and share at Geosynthetics 2013
October 1st, 2012
Geosynthetics 2013 is co-locating with the Southwest Geotechnical Engineers Conference and will also feature the Geosynthetic Research Institute’s 25th conference. Explore The Trade Show The exhibit hall will be filled with companies featuring every facet of the geosynthetics industry—manufacturers and service providers showcasing geosynthetic and geotechnical solutions, technologies, and innovations. Learn General Sessions The Geosynthetics […]
Shear strength of geosynthetic clay liners
October 1st, 2012
Part 1: Strength measurement By Patrick J. Fox, Ph.D., P.E., and Chris Athanassopoulos, P.E. Introduction The geosynthetic clay liner (GCL) has been with us for 30 years. Originally invented in the early 1980s as a flexible alternative to rigid waterproofing materials, GCLs are now used worldwide as hydraulic barriers in waste containment facilities, heap leach […]
More accurate liner integrity surveys using electrically conductive GM
October 1st, 2012
By David Gallagher and Abigail Beck Introduction The electrical liner integrity (ELI) survey is currently the most effective and practical means of locating leaks in installed geomembranes after cover soil installation, as detailed in ASTM D7007. The technology functions along the principle that polyethylene geomembranes are electrically insulative. By applying an electrical potential across a […]
Traditional vs. exposed geomembrane landfill covers
October 1st, 2012
The articles in this series encompass all types of geosynthetics and their applications viewed from the context of sustainability. Traditional solutions are compared with geosynthetic solutions from both cost and carbon footprint perspectives. (from the Geosynthetic Research Institute’s 24th conference, 2011) Cost and sustainability perspectives Abstract All municipal solid waste (MSW) landfills require a final […]
The basis for landfill closure, remediation, and redevelopment
October 1st, 2012
Reuse and recycle By Joan A. Smyth and Stacey A. Smith Introduction The Lexington County Highway 321 landfill site was recently awarded the U.S. Environmental Protection Agency’s (EPA) Region 4 Excellence in Site Reuse: Superfund Redevelopment Award. This site, located in West Columbia, S.C., contains several waste disposal areas that were active from the 1950s […]
Massive soil reinforcement at Cherry Island extends landfill’s use for decades
October 1st, 2012
Finalist for 2012 award for Outstanding Civil Engineering Achievement By Ron Bygness The challenge Cherry Island Landfill, operated by the Delaware Solid Waste Authority (DSWA), has been used for municipal solid-waste disposal since 1985. Built on an old dredge disposal site at the confluence of the Delaware and Christina rivers in Wilmington, Del., the subsurface […]